docs: def get_assays(identifier, namespace='aid', **kwargs):
      """Retrieve the specified assay records from PubChem.
  
      :param identifier: The assay identifier to use as a search query.
      :param namespace: (optional) The identifier type.
      """
      results = get_json(identifier, namespace, 'assay', 'description', **kwargs)
      return [Assay(r) for r in results['PC_AssayContainer']] if results else []